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refclock_phc: open device for writing with extpps option

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In version 6.15 the Linux kernel started checking write access on the
PHC file descriptor in the PTP_PIN_SETFUNC and PTP_EXTTS_REQUEST ioctls.
chronyd opened the PHC device as readonly, which caused the PHC refclock
driver configured with the extpps option to fail with the
"Could not enable external PHC timestamping" error message.

To ensure compatibility with new kernel versions, add flags to the
SYS_Linux_OpenPHC() function and open the device with the O_RDWR flag
when the extpps option is enabled.
This commit is contained in:
Miroslav Lichvar
2025-08-07 14:04:22 +02:00
parent b365edb48e
commit f78e4681ef
4 changed files with 17 additions and 16 deletions
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10
sys_linux.c
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@@ -879,7 +879,7 @@ verify_fd_is_phc(int phc_fd)
/* ================================================== */
static int
open_phc_by_iface_name(const char *iface)
open_phc_by_iface_name(const char *iface, int flags)
{
#ifdef HAVE_LINUX_TIMESTAMPING
struct ethtool_ts_info ts_info;
@@ -922,7 +922,7 @@ open_phc_by_iface_name(const char *iface)
"/dev/ptp%d", ts_info.phc_index) >= sizeof (phc_device))
return -1;
return open(phc_device, O_RDONLY);
return open(phc_device, flags);
#else
return -1;
#endif
@@ -931,18 +931,18 @@ open_phc_by_iface_name(const char *iface)
/* ================================================== */
int
SYS_Linux_OpenPHC(const char *device)
SYS_Linux_OpenPHC(const char *device, int flags)
{
int phc_fd = -1;
if (device[0] == '/') {
phc_fd = open(device, O_RDONLY);
phc_fd = open(device, flags);
if (phc_fd >= 0)
phc_fd = verify_fd_is_phc(phc_fd);
}
if (phc_fd < 0) {
phc_fd = open_phc_by_iface_name(device);
phc_fd = open_phc_by_iface_name(device, flags);
if (phc_fd < 0) {
LOG(LOGS_ERR, "Could not open PHC of iface %s : %s",
device, strerror(errno));